The invention relates to an apparatus (1) for holding bait (2), in particular bait for rodents, comprising: a housing part (3) that can be inserted into a manhole, in particular a sewer manhole or a cable duct manhole, at least one bait platform (8) arranged in the housing part (3), delimiting at least one passage opening (9) on the bait platform side, through which a rodent can gain access to bait (2) arranged in the housing part (3).

System for drainage of surface water, the system comprises a number of tanks being connected to a main pipeline leading water to a recipient. Each tank has at least one outlet for leading water from the tank to the main pipeline, and a corresponding lid, the lid is limiting the outlet until the water is at a predetermined level in the tank. The system further comprises a check valve arranged downstream of the outlet of each tank, preventing water from entering the tank from the main pipeline, and at least one air bleeder valve and at least one siphonic drainage regulator arranged between a tank and the recipient.

A drain system for water quality. The drain system may include one or more baffles. The one or more baffles may be arcuate in shape. The one or more baffles may include one or more openings therethrough. The one or more baffles may be offset in elevation. The one or more baffles may include one or more flanges projecting therefrom. The one or more baffles may be implemented in a flow-through manhole application.

A drain system for water quality. The drain system may include one or more baffles. The one or more baffles may be arcuate in shape. The one or more baffles may include one or more openings therethrough. The one or more baffles may be offset in elevation. The one or more baffles may include one or more flanges projecting therefrom. The one or more baffles may be implemented in a flow-through manhole application.

A skimmer for use in a manhole includes a frame and cladding. The frame includes an adjustable arc having an adjustable overall length and including an arced member, a first side member and a second side member. The arced member has a first end and a second end opposite the first end and defining a curve therebetween. The first side member is slidably adjustable relative to a first end of the arced member and selectively coupled thereto in one of a plurality of predefined first side member positions. The second side member is slidably adjustable relative to a second end of the arced member and selectively couplable thereto in one of a plurality of predefined second side member positions. The cladding covers a substantially entirety of one side of the frame.

A skimmer for use in a manhole includes a frame and cladding. The frame includes an adjustable arc having an adjustable overall length and including an arced member, a first side member and a second side member. The arced member has a first end and a second end opposite the first end and defining a curve therebetween. The first side member is slidably adjustable relative to a first end of the arced member and selectively coupled thereto in one of a plurality of predefined first side member positions. The second side member is slidably adjustable relative to a second end of the arced member and selectively couplable thereto in one of a plurality of predefined second side member positions. The cladding covers a substantially entirety of one side of the frame.

The invention provides for a secondary overflow pipe and connector (10) connectable to a sewer system, the secondary overflow pipe increasing overall capacity of the sewer system during peak flows, the connector (10) connectable to a manhole (16) and shaped to define a funnel to reduce turbulence and facilitate a smooth flow pattern and maximum flow capacity.

A method and device for controlling EM radiation from an exposed manhole around roadways. A remote field unit controller is disposed under a manhole cover proximal to a roadway, with a sensor attached to either the manhole cover, a manhole, or the remote field unit controller, providing information of at least one of a position, acceleration, direction of the manhole cover. An EM transmitter/receiver and EM emitter/absorber are disposed under the manhole cover and an EM controller communicates to the EM transmitter. When the sensor detects sufficient movement of the manhole cover, a signal is sent to the remote field unit controller to at least one of suppress, alter, and turn off EM emissions from the EM transmitter so as to prevent EM radiation from entering the roadway. The EM transmitter is at least one of a lidar, infrared, EM, and time-of-flight emitter or sensor.

A method and device for controlling EM radiation from an exposed manhole around roadways. A remote field unit controller is disposed under a manhole cover proximal to a roadway, with a sensor attached to either the manhole cover, a manhole, or the remote field unit controller, providing information of at least one of a position, acceleration, direction of the manhole cover. An EM transmitter/receiver and EM emitter/absorber are disposed under the manhole cover and an EM controller communicates to the EM transmitter. When the sensor detects sufficient movement of the manhole cover, a signal is sent to the remote field unit controller to at least one of suppress, alter, and turn off EM emissions from the EM transmitter so as to prevent EM radiation from entering the roadway. The EM transmitter is at least one of a lidar, infrared, EM, and time-of-flight emitter or sensor.

A safety grating has an arch shape cross section and is useful within a riser having a frusto-conical shape wall which riser is attached to a septic tank or another structure. The grating comprises a hub and radially extending arms, one or more of which is rotatable relative to the hub length at a hinge joint, to decrease the size of the grating and enable installation of the grating by passing the grating a smaller end opening of a riser.